Metastructure Engineering with Ruddlesden-Popper 2D Perovskites: Stability, Flexibility, and Quality Factor Trade-Offs.

In this study, we investigate the opto-electro-mechanical properties, thermodynamic stability, and moisture stability of the Ruddlesden-Popper (RP) two-dimensional perovskites of LPbI (L = PEA, FPEA, BA, and BZA) using density functional theory. The goal is to explore their potential application in metastructures. The results show that the stability of FPEAPbI is better than that of PEAPbI, BAPbI, and BZAPbI due to the replacement of a hydrogen atom with a fluorine atom.

Design and analysis of a flexible Ruddlesden-Popper 2D perovskite metastructure based on symmetry-protected THz-bound states in the continuum.

A Ruddlesden-Popper 2D perovskite PEAPbX (X = I, Br, and Cl) is proposed for metasurface applications. Density functional theory is used to analyze the optical, electrical, mechanical properties, moisture and thermodynamic stability of PEAPbX. The refractive index of PEAPbX varies with the halides, resulting in 2.

Quasi-BIC based all-dielectric metasurfaces for ultra-sensitive refractive index and temperature sensing.

In this paper, an all-dielectric metasurface that measures refractive index and temperature using silicon disks is presented. It can simultaneously produce three resonances excited by a magnetic toroidal dipole, magnetic toroidal quadrupole, and electric toroidal dipole, in the THz region. Asymmetric structures are used to generate two quasi-bound states in the continuum (BIC) resonances with ultra-high-quality factors driven by magnetic and electric toroidal dipoles.